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<div><a href="../index.html">Home</a> &gt;  <a href="index.html">fvcom_prepro</a> &gt; example_my_project.m</div>

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<h1>example_my_project
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>function [out_east,out_north] = my_project(in_east,in_north,direction)</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="box"><strong>This is a script file. </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre class="comment">function [out_east,out_north] = my_project(in_east,in_north,direction)</pre></div>

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<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../matlabicon.gif)">
</ul>
This function is called by:
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</ul>
<!-- crossreference -->



<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>
<div class="fragment"><pre>0001 <span class="comment">%function [out_east,out_north] = my_project(in_east,in_north,direction)</span>
0002 
0003 <span class="comment">% Sample user-defined projection and inverse projection of (lon,lat) to (x,y)</span>
0004 <span class="comment">% Copy to my_project (not a member of the toolbox) and modify to suite you</span>
0005 <span class="comment">%</span>
0006 <span class="comment">% function [out_east,out_north] = my_project(in_east,in_north,direction)</span>
0007 <span class="comment">%</span>
0008 <span class="comment">% DESCRIPTION:</span>
0009 <span class="comment">%    Define projections between geographical and Euclidean coordinates</span>
0010 <span class="comment">%</span>
0011 <span class="comment">% INPUT:</span>
0012 <span class="comment">%   in_east   = 1D vector containing longitude (forward) x (reverse)</span>
0013 <span class="comment">%   in_north  = 1D vector containing latitude  (forward) y (reverse)</span>
0014 <span class="comment">%   direction = ['forward' ;  'inverse']</span>
0015 <span class="comment">%</span>
0016 <span class="comment">% OUTPUT:</span>
0017 <span class="comment">%   (lon,lat) or (x,y) depending on choice of forward or reverse projection</span>
0018 <span class="comment">%</span>
0019 <span class="comment">% EXAMPLE USAGE</span>
0020 <span class="comment">%    [lon,lat] = my_project(x,y,'reverse')</span>
0021 <span class="comment">%</span>
0022 <span class="comment">% Author(s):</span>
0023 <span class="comment">%    Geoff Cowles (University of Massachusetts Dartmouth)</span>
0024 <span class="comment">%</span>
0025 <span class="comment">% Revision history</span>
0026 <span class="comment">%</span>
0027 <span class="comment">%==============================================================================</span>
0028 
0029 <span class="comment">%subname = 'my_project';</span>
0030 <span class="comment">%fprintf('\n')</span>
0031 <span class="comment">%fprintf(['begin : ' subname '\n'])</span>
0032 
0033 <span class="comment">%------------------------------------------------------------------------------</span>
0034 <span class="comment">% Parse input arguments</span>
0035 <span class="comment">%------------------------------------------------------------------------------</span>
0036 
0037 ProjectDirection = <span class="string">'forward'</span>;
0038 
0039 <span class="keyword">if</span>(direction == <span class="string">'forward'</span>)
0040     ProjectDirection = <span class="string">'forward'</span>;
0041         lon = in_east;
0042         lat = in_north;
0043 <span class="keyword">else</span>
0044     ProjectDirection = <span class="string">'inverse'</span>;
0045         x = in_east;
0046         y = in_north;
0047 <span class="keyword">end</span>;
0048 
0049 
0050 
0051 <span class="comment">%------------------------------------------------------------------------------</span>
0052 <span class="comment">% Perform the projection:  USER DEFINED</span>
0053 <span class="comment">% Example:  project/inverse project to state plane 1802</span>
0054 <span class="comment">%------------------------------------------------------------------------------</span>
0055 
0056 <span class="comment">%if(ProjectDirection == 'forward')</span>
0057 <span class="comment">%    fprintf('Projecting from (lon,lat) to (x,y)\n');</span>
0058 <span class="comment">%    [x,y] = sp_proj('1802','forward',lon,lat,'m');</span>
0059 <span class="comment">%</span>
0060 <span class="comment">%else</span>
0061 <span class="comment">%    fprintf('Inverse Projecting from (x,y) to (lon,lat)\n')</span>
0062 <span class="comment">%    [lon,lat] = sp_proj('1802','inverse',x,y,'m');</span>
0063 <span class="comment">%end;</span>
0064 
0065 <span class="comment">%------------------------------------------------------------------------------</span>
0066 <span class="comment">% Skagit, UTM, Zone 10 (see http://www.dmap.co.uk/utmworld.htm)</span>
0067 <span class="comment">%------------------------------------------------------------------------------</span>
0068 m_proj(<span class="string">'UTM'</span>,<span class="string">'longitude'</span>,[-123,-120],<span class="string">'latitude'</span>,[47,49],<span class="string">'zone'</span>,10,<span class="string">'hemisphere'</span>,<span class="string">'north'</span>,<span class="string">'ellipsoid'</span>,<span class="string">'wgs84'</span>)
0069 <span class="comment">%m_proj get</span>
0070 <span class="comment">%[x,y] = m_ll2xy(-122.530820 , 48.363114);</span>
0071 <span class="comment">%fprintf('x %f y %f\n',x,y-1e7);</span>
0072 <span class="comment">%fprintf('should be 534752, 5356766.\n')</span>
0073 deltay = 1e7;
0074 
0075 <span class="keyword">if</span>(ProjectDirection == <span class="string">'forward'</span>)
0076 <span class="comment">%    fprintf('Projecting from (lon,lat) to (x,y)\n');</span>
0077     [x,y]=m_ll2xy(lon,lat); 
0078     y = y - deltay; <span class="comment">%why?</span>
0079 <span class="keyword">else</span>
0080 <span class="comment">%    fprintf('Inverse Projecting from (x,y) to (lon,lat)\n')</span>
0081     [lon,lat]=m_xy2ll(x,y+deltay); 
0082 <span class="keyword">end</span>;
0083 
0084 
0085 <span class="comment">% set the output</span>
0086 <span class="keyword">if</span>(ProjectDirection == <span class="string">'forward'</span>)
0087   out_east = x;
0088   out_north = y;
0089 <span class="keyword">else</span>
0090   out_east = lon;
0091   out_north = lat;
0092 <span class="keyword">end</span>;
0093</pre></div>
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